发明授权
- 专利标题: Logical drawing and transparency circuits for bit mapped video display controllers
- 专利标题(中): 位映像视频显示控制器的逻辑图和透明电路
-
申请号: US120902申请日: 1987-11-16
-
公开(公告)号: US4893116A公开(公告)日: 1990-01-09
- 发明人: David L. Henderson , Brian K. Herbert , Michael D. Lahey , Jamey L. Robbins
- 申请人: David L. Henderson , Brian K. Herbert , Michael D. Lahey , Jamey L. Robbins
- 申请人地址: OH Dayton
- 专利权人: NCR Corporation
- 当前专利权人: NCR Corporation
- 当前专利权人地址: OH Dayton
- 主分类号: G09G1/28
- IPC分类号: G09G1/28 ; G09G5/02 ; G09G5/36
摘要:
An interface controller, situated between a graphics controller and a memory array in a color video display system operable in a read-modify-write mode, configured to detect a select transparency color in whole or in part and to respond by selectively changing the color binary data for the corresponding pixel in a frame buffer. In another aspect, the invention includes drawing modes impelmented by logically combining pixel color binary data in accordance with a defined truth table so as to allow the pixel color data representing a new image to interact in a defined manner based upon color with the data in a previously defined image. As implemented, the binary data in the frame buffer is acted upon in a read-modify-write sequence whereby the various logic operations analyze the source (foreground) pixel data, the destination (background) pixel data, in the context of control signals, to define the pixel color data written into the frame buffer as the color representation for that pixel position.
公开/授权文献
- US6138371A Package size guage 公开/授权日:2000-10-31